The Atom
True or False: All atoms are negative
FALSE.
Same number of protons and electrons
What are the columns called?
Groups or families
What is the definition of a chemical reaction?
a change in matter that produces one or more new substances
How many molecules are in CO2
3. 1 carbon, 2 oxygen
What can control the rate that a chemical reaction occurs?
What is the nucleus of an atom surrounded by?
Electrons
What are the rows called?
Periods
What is an exothermic reactions?
A chemical reaction that releases energy in the form of heat
What does the arrow in a chemical equation mean?
yields
What is activation energy?
The minimum amount of energy needed to start a chemical reaction.
What is the positive particle of an atom?
Proton
What column is hydrogen found in?
1
What is a molecule?
A particle made of two or more atoms bonded together.
What is the conservation of mass?
The amount of matter involved in a chemical reaction does not change. The total mass of the reactants must equal the total mass of the products.
How does surface area affect the rate of a chemical reaction?
The more surface area the faster the reaction
What makes up the atomic mass of an atom?
The neutrons and protons. NOT the electrons because they are extremely small.
Using your periodic table, list 2 noble gases.
Xenon, Helium, Neon, Argon, Krypton, Radon
What is a compound?
A substance made of two or more elements that have been chemically combined
Balance Na + Cl2 --> NaCl
2NA + Cl2 --> 2NaCl
What will happen to the rate of a chemical reaction if the temperature is low.
The reaction will not happen as fast.
What are valence electrons?
The electrons that are the farthest away from the nucleus.
Metalloids are great at what?
Conducting electricity
Give one piece of evidence a chemical change may have occured.
Gas production, color change, precipitate forms, bubbling
What kind of reaction is this:
Fe2O3 + C --> Fe + CO2
Single replacement
What are the two types of inhibitors?
Competitive and non-competitive